Integrin Receptors
Integrin Receptors - Related Videos
01:10
Integrins
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2023
Animal and protozoan cells do not have cell walls to help maintain shape and provide structural stability. Instead, these eukaryotic cells secrete a sticky mass of carbohydrates and proteins into the spaces between adjacent cells. This network of proteins and molecules is called an extracellular matrix or ECM. Some ECM proteins assemble into a basement membrane to which the remaining components adhere. Proteoglycans typically form the bulk of the ECM while fibrous proteins, like collagen,...
01:15
Activation of Integrins
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2023
Integrins bind ligands and transmit information from outside the cell to inside or vice-versa through an "outside-in signaling" or "inside-out signaling." In "outside-in signaling," external factors in the extracellular space bind to exposed ligand binding sites on integrins. This causes the inactive protein to undergo a conformational change to become active. Integrins are often clustered on the cell membrane. Repetitive and regularly spaced ligand binding events provide an effective stimulus.
12:38
Titration ELISA as a Method to Determine the Dissociation Constant of Receptor Ligand Interaction
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Cited by 29 •
2018
A detailed protocol to perform a titration ELISA is described. Moreover, a novel algorithm is presented to evaluate titration ELISAs and to obtain a dissociation constant of binding of a soluble ligand to a microtiter plate-immobilized receptor.
12:03
Receptor Autoradiography Protocol for the Localized Visualization of Angiotensin II Receptors
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Cited by 14 •
2016
Here we present a protocol to describe the localization of angiotensin II Type 1 receptors in the rat brain by quantitative, densitometric, in vitro receptor autoradiography using an iodine-125 labeled analog of angiotensin II.
09:14
Static Adhesion Assay for the Study of Integrin Activation in T Lymphocytes
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Cited by 21 •
2014
Static adhesion assay is a powerful tool that can be used to model the interactions between T lymphocytes and other cell types. Interactions are generated by injecting labeled T cells into wells coated with adhesion molecules, while a plate reader is used to quantify the number of adherent cells following serial washes.
FAQs
Ligand binding to fibronectin or collagen induces a conformational change in the integrin heterodimer. This structural shift supports bidirectional signaling, allowing extracellular conditions to influence the cytoskeleton while intracellular signals alter how the receptor engages its surroundings. The resulting communication helps coordinate cell survival, movement, proliferation, and differentiation with the organization of surrounding tissue.
The α and β subunits combine to form a particular ligand-binding heterodimer, giving integrin receptors distinct extracellular binding properties. Because different heterodimers can recognize different extracellular matrix proteins, the subunit composition influences which environmental cues a cell detects. This specificity helps determine how cells attach, organize their cytoskeleton, and respond to their tissue surroundings.
Focal adhesions provide organized sites where integrin-associated signals connect with the actin cytoskeleton. This coupling links extracellular matrix attachment to internal cellular structure, allowing forces and positional information to influence cell behavior. Through these assemblies, integrins contribute to mechanotransduction, the conversion of mechanical cues into biological responses that affect migration, proliferation, and differentiation.
Mechanotransduction allows cells to sense and respond to physical conditions at their attachments. Integrin-mediated connections between the extracellular matrix, focal adhesions, and actin cytoskeleton transmit information in both directions. As a result, mechanical and adhesive cues can shape movement, tissue organization, differentiation, and survival rather than serving only as passive attachment signals.
These receptors provide a framework for examining how cells coordinate attachment, movement, survival, and tissue organization during wound healing and development. Researchers can relate extracellular matrix interactions, focal adhesion assembly, and cytoskeletal coupling to changes in migration, proliferation, and differentiation. This connects molecular signaling events with the larger-scale formation or repair of organized tissues.
Integrin signaling is relevant to inflammation and cancer because it regulates cell movement, survival, proliferation, and activation, including immune-cell activation. Studying the receptor-mediated links among extracellular matrix proteins, focal adhesions, and the cytoskeleton helps investigators connect local adhesion signals with broader changes in cell behavior. These relationships make integrins an important focus of biological and biomedical research.